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Predicting the elemental compositions of solid waste using ATR-FTIR and machine learning

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Frontiers of environmental Science & Engineering 2023年第10期17卷 41-54页

作者： Haoyang Xian Pinjing He Dongying Lan Yaping Qi Ruiheng Wang Fan Lü Hua Zhang Jisheng Long institute of Waste Treatment&Reclamation College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai institute of Pollution Control and Ecological Security Shanghai 200092China Shanghai Engineering research Center of Multi-source solid wastes Co-processing and Energy Utilization Shanghai 200092China Shanghai SUS environment Co. Ltd.Shanghai 201703China

Elemental composition is a key parameter in solid waste treatment and disposal. This study has proposed a method based on infrared spectroscopy and machine learning algorithms that can rapidly predict the elemental composition (C, H, N, S) of solid waste. Both noise and moisture spectral interference that may occur in practical application are investigated. By comparing two feature selection methods and five machine learning algorithms, the most suitable models are selected. Moreover, the impacts of noise and moisture on the models are discussed, with paper, plastic, textiles, wood, and leather as examples of recyclable waste components. The results show that the combination of the feature selection and K-nearest neighbor (KNN) approaches exhibits the best prediction performance and generalization ability. Particularly, the coefficient of determination (R2) of the validation set, cross validation and test set are higher than 0.93, 0.89, and 0.97 for predicting the C, H, and N contents, respectively. Further, KNN is less sensitive to noise. Under moisture interference, the combination of feature selection and support vector regression or partial least-squares regression shows satisfactory results. Therefore, the elemental compositions of solid waste are quickly and accurately predicted under noise and moisture disturbances using infrared spectroscopy and machine learning algorithms.

关键词： Elemental composition Infrared spectroscopy Machine learning Moisture interference solid waste Spectral noise

Expanded graphite confined SnO_(2) as anode for lithium ion batteries with low average working potential and enhanced rate capability

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Journal of Materials Science & Technology 2022年第12期107卷 165-171页

作者： Xianghong Chen Haiying Lu Yu Lei Jiakui Zhang Feng Xiao Rui Wang Peiran Xie Jiantie Xu School of environment and Energy National Engineering Laboratory for VOCs Pollution Control Technology and EquipmentGuangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou 510640China

1. Introduction As the state-of-the-art power resources, lithium ion batteries(LIBs) have dominated the market of smart and portable electronic devices over the past several decades. At present, LIBs have been considered as one of the leading technologies for electric vehicles(EVs) and stationary energy storage systems(ESSs) [1,2]. In order to meet the high demands arising from large-scale applications of EVs and ESSs, the development of LIBs with high energy densities, long cycle life and safe operating environment becomes critically important.

关键词： lithium smart potential

Lattice-strained nanotubes facilitate efficient natural sunlight-driven CO_(2) photoreduction

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Nano research 2021年第8期14卷 2558-2567页

作者： Shujie Liang Xueming Liu Zuqi Zhong Bin Han Xiaohui Zhong Weiyi Chen Kainan Song Hong Deng Zhang Lin School of environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling South China University of TechnologyGuangzhou 510006China Guangdong Engineering and Technology research Center for environmental Nanomaterials The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education)Guangzhou 510006China

Photocatalytic reduction of CO_(2) holds tremendous promise for alleviating the energy *** the progress that has been,made,there are still some challenges to overcome,such as the realization under real sunlight rather than the simulation *** this work,ultrathin Ni_(2)(OH)(PO_(4))nanotubes(NTs)prepared through hydrothermal route are applied as a novel catalyst for photocatalytic reduction of CO_(2) under real *** prepared Ni_(2)(OH)(PO_(4))NTs exhibit a 11.3 μmol·h^(-1) CO production rate with,96.1% CO ***,Ni_(2)(OH)(PO_(4))NTs have a positive impact on the facilitation of photoreduction in diluted CO_(2).Notably,when the system is performed under real sunlight,Ni_(2)(OH)(PO_(4))NTs afford an accumulated CO of ca.26.8 nmol with,96.9% CO selectivity,exceeding most previous inorganic catalysts under simulated irradiation in the *** experimental results demonstrate that the multisynergetic effects induced by surface-OH and the lattice strain serve as highly active sites for CO_(2) molecular adsorption and activation as well as electron transfer,hence enhancing photoreduction ***,this work provides experimental basis that CO_(2) photocatalysis can be put into practical use.

关键词： CO_(2)photoreduction diluted CO_(2) lattice strain natural sunlight application

research progress of composite cathode materials for solid oxide fuel cells

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Progress in Natural Science:Materials International 2023年第3期33卷 267-278页

作者： Qunyang Long Rui Sha Ruohang Wang Bo Xu Haichao Men Qi Wang Jie Hou Engineering research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences School of Resource environment and Safety Engineering University of South China

solid oxide fuel cell(SOFC) is a device that converts the chemical energy of hydrogen or hydrocarbons and oxygen into electric energy through electrochemical reaction, with high efficiency and low emissions. Cathode materials with high electrochemical catalytic activity, stability and medium-low temperature durability continue to play a crucial role in SOFC. However, single-phase cathode materials suffer from low conductivity, low activity and poor thermal matching. Therefore, various composite technologies have been employed to enhance the performance of SOFC cathodes. In this review, various composite methods have been illustrated including mechanical-physical composite, infiltration composite and in-situ composite. Besides, this article provides an overview of the fundamentals, recent advances, advantages, disadvantages, challenges, and prospects of these composite methods. Furthermore, this article provides valuable guidance and potential directions for the development of composite cathode materials.

关键词： SOFC Composite cathode materials Composite methods Mechanical-physical composite Infiltration composite In-situ composite

Improving the stability and scalability of all-inorganic inverted CsPbI_(2)Br perovskite solar cell

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Journal of Energy Chemistry 2022年第5期31卷 176-183页

作者： Chenghao Duan Qiaoyun Wen Yan Fan Jiong Li Zidan Liu Keyou Yan School of environment and Energy State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou 510000GuangdongChina Medical Devices research&Testing Center South China University of TechnologyGuangzhou 510000GuangdongChina

All-inorganic perovskite solar cells(PSCs) have potential to pass the stability international standard of IEC61215:2016 but cannot deliver high performance and stability due to the poor interface contact. In this paper, Sn-doped TiO_(2)(Ti_(1-x)Sn_(x)O_(2)) ultrathin nanoparticles are prepared for electron transport layer(ETL) by solution process. The ultrathin Ti_(1-x)Sn_(x)O_(2) nanocrystals have greatly improved interface contact due to the facile film formation, good conductivity and high work function. The all-inorganic inverted NiOx/CsPbI_(2)Br/Ti_(1-x)Sn_(x)O_(2)p-i-n device shows a power conversion efficiency(PCE) of 14.0%. We tested the heat stability, light stability and light-heat stability. After stored in 85℃ for 65 days, the inverted PSCs still retains 98% of initial efficiency. Under continuous standard one-sun illumination for 600 h,there is no efficiency decay, and under continuous illumination at 85℃ for 200 h, the device still retains 85% of initial efficiency. The 1.0 cm^(2) device of inverted structure shows a PCE of up to 11.2%. The ultrathin Ti_(1-x)Sn_(x)O_(2)is promising to improve the scalability and stability and thus increase the commercial prospect.

关键词： All-inorganic perovskite Sn-doped TiO_(2) Ultrathin nanocrystal Stability Scalability

Remediation performance and mechanisms of Cu and Cd contaminated water and soil using Mn/Al-layered double oxide-loaded biochar

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Journal of environmental Sciences 2023年第3期125卷 593-602页

作者： Pengcheng Lin Hang Liu Hua Yin Minghan Zhu Haoyu Luo Zhi Dang School of environment and Energy South China University of TechnologyGuangzhou 510006China Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters Guangzhou 510006China Guangdong Provincial Key Laboratory of solid wastes Pollution Control and Recycling Guangzhou 510006China

The combined pollution of heavy metals is ubiquitous ***/Al-layered double oxide-loaded crab shells biochar (LDO/BC) was prepared,so as to remediate the combined pollution of Cd and Cu in soil and *** pristine and used LDO/BC were characterized and the results revealed that the layered double oxide was successfully loaded on crab shells biochar (BC) and metal element Ca in crab shells was beneficial to the formation of more regular layered and flake *** maximal adsorption capacity (Qm) of LDO/BC for aqueous Cu^(2+)and Cd^(2+)was 66.23 and 73.47 mg/g,***/BC and BC were used to remediate e-waste-contaminated soil for the first time and exhibited highly efficient *** extraction amount of Cu and Cd in the contaminated soil by diethylene triamine penta-acetic acid (DTPA) after treating with 5% LDO/BC was significantly reduced from 819.84 to 205.95 mg/kg (with passivation rate 74.8%) and 8.46 to 4.16 mg/kg(with passivation rate 50.8%),respectively,inferring that the bioavailability of heavy metals declined *** experimental result also suggested that after remediation by LDO/BC the exchangeable and weak acid soluble Cu and Cd in soil translated to reducible,residual and oxidizable fraction which are more stable ***,complexation and ion exchange were proposed as the possible mechanisms for Cd and Cu *** general,these experiment results indicate that LDO/BC can be a potentially effective reagent for remediation of heavy metal contaminated water and soil.

关键词： Mn/Al-layered double oxide Biochar Cd and Cu combined pollution Adsorption Soil remediation

Remediation of Cu and As contaminated water and soil utilizing biochar supported layered double hydroxide:Mechanisms and soil environment altering

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Journal of environmental Sciences 2023年第4期126卷 275-286页

作者： Pengling Shao Hua Yin Yingchao Li Yuhao Cai Caiya Yan Yibo Yuan Zhi Dang School of environment and Energy South China University of TechnologyGuangzhou 510006China Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters Guangzhou 510006China Guangdong Provincial Key Laboratory of solid wastes Pollution Control and Recycling Guangzhou 510006China

Preparing materials for simultaneous remediation of anionic and cationic heavy metals contamination has always been the focus of research. Herein a biochar supported FeMnMg layered double hydroxide(LDH) composites(LB) for simultaneous remediation of copper and arsenic contamination in water and soil has been assembled by a facile co-precipitation approach. Both adsorption isotherm and kinetics studies of heavy metals removal by LB were applied to look into the adsorption performance of adsorbents in water. Moreover, the adsorption mechanisms of Cu and As by LB were investigated, showing that Cu in aqueous solution was removed by the isomorphic substitution, precipitation and electrostatic adsorption while As was removed by complexation. In addition, the availability of Cu and As in the soil incubation experiments was reduced by 35.54%–63.00% and 8.39%–29.04%, respectively by using LB. Meanwhile, the addition of LB increased the activities of urease and sucrase by 93.78%–374.35% and 84.35%–520.04%, respectively, of which 1% of the dosage was the best. A phenomenon was found that the richness and structure of microbial community became vigorous within 1% dosage of LB, which indirectly enhanced the passivation and stabilization of heavy metals. These results indicated that the soil environment was significantly improved by LB. This research demonstrates that LB would be an imaginably forceful material for the remediation of anionic and cationic heavy metals in contaminated water and soil.

关键词： Heavy metal Biochar supported layered double hydroxide composite Adsorption mechanism Soil remediation Microbial community

Boosted photoreduction of diluted CO_(2) through oxygen vacancy engineering in NiO nanoplatelets

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Nano research 2021年第3期14卷 730-737页

作者： Weiyi Chen Xueming Liu Bin Han Shujie Liang Hong Deng Zhang Lin School of environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Resource RecyclingSouth China University of TechnologyGuangzhou510006China Guangdong Engineering and Technology research Center for environmental Nanomaterials Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education)South China University of TechnologyGuangzhou510006China

Converting carbon dioxide(CO_(2))to diverse value-added products through photocatalysis can validly alleviate the critical issues of greenhouse effect and energy shortages *** particular,based on practical considerations,exploring novel catalysts to achieve efficient photoreduction of diluted CO_(2) is necessary and ***,this process is extremely challenging owing to the disturbance of competitive adsorption at low CO_(2) ***,we delicately synthesize oxygen vacancy-laden NiO nanoplatelets(r-NiO)via calcination under Ar protection to reduce diluted CO_(2) through visible light irradiation(>400 nm)assisted by a Ru-based *** from the strongly CO_(2) adsorption energy of oxygen vacancies,which was confirmed by density functional calculations,the r-NiO catalysts exhibit higher activity and selectivity(6.28×10^(3)µmol·h^(−1)·g^(−1);82.11%)for diluted CO_(2)-to-CO conversion than that of the normal NiO(3.94×10^(3)µmol·h^(−1)·g^(−1);65.26%).Besides,the presence of oxygen vacancies can also promote the separation of electron-hole *** research demonstrates that oxygen vacancies could act as promising candidates for photocatalytic CO_(2) reduction,offering fundamental guidance for the actual photoreduction of diluted CO_(2) in the future.

关键词： diluted CO_(2) photocatalytic reduction oxygen vacancies NiO nanoplatelets adsorption

Phase relations,microstructure,and valence transition studies on CaZr1-xCexTi2O7(0.0≤x≤1.0)system

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Journal of Rare Earths 2018年第11期36卷 1184-1189页

作者： Weimin Li Faqin Dong Liang Bian Hao Zou Mianxin Song research Center of Laser Fusion China Academy of Engineering PhysicalMianyang 621900China Fundamental Science on Nuclear wastes and environmental Safety Laboratory Southwest University of Science and TechnologyMianyang 621010China Laboratory of solid Waste Treatment and Resource Recycle Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China Hebei University of Geosciences Shijiazhuang 050000China

In this study, Ce-doped zirconolite was synthesized through high-temperature solid-state reaction at 1250 ℃ in air for 96 h. The crystal phase, microstructure and valence transition were studied by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and X-ray photoelectron spectroscopy （XPS）. Phase relations of CaZrl xCexTi207 systems were determined by XRD analyses and Rietveld refinements. Four different phases are identified, namely zirconolite, perovskite, pyrochlore, and cerianite. The phase transformation （2M-zirconolite → 4M-zirconolite →Ce-pyrochlore） is caused by cations rearrangement as cerium content increases. The solubility limit of cerium ions in CaZrl .xCexTi207 system is estimated to be approximately 0.80. Under sintering air atmosphere, partial reduction of Ce^4＋ in Ce^3＋ is detected in Ce 3d XPS soectra, and the ratio of Ce^3＋ and Ce^4＋ significantly decreases as cerium content increases.

关键词： Zirconolite Ce-pyrochlore Phase relations Valence transition Rare earths